Thank you Ranjan Dailata :-) … I had this doubt because github can be used as a static website host with .github.io subdomain and with jekyll it can be used as a CMS/Blog with flat file storage. So I had a confusion if we can has a NodeJS server …

Sai Prasad Static web pages are fine. Folks do use it for documentation purpose. Github is not a Web or a App server. Some little tricks you can do with Github like having a static pages and making an Ajax call to render data. Here’s one example - http://pazguille.github.io/github-card/